There are a lot of Drupal features we end up missing out on when going fully Decoupled. In a lot of scenarios, only a part of our application needs the functionality that Decoupled Drupal provides, and going overboard ends up hurting us more than it saves our time.
Can't we have your cake and eat it too? Well, we certainly can when we decouple progressively. With such an architecture we get to enjoy the strong suite of both Drupal and the Frontend framework without worrying about how to scale our infrastructure or the team.